Travelers looking to visit America’s national parks now have a new tool to assist in their trip planning.

The National Park Service recently released a new mobile phone application, which provides links to all 397 national park websites and allows users to keep track of the parks visited. Users can also add photos and description of their park trips, or can make a wish list of the parks they want to visit.

The new app was launched in time for National Park Week April 21-29, when it’s free to enter the parks.

The free app is is available for download at iTunes.com for use on iPhones and iPads.

It was developed by Eastern National, a long time nonprofit educational partner, the National Park Service said in a release.

“This app is a terrific new tool that will excite our visitors,” National Park Service Director Jonathan B. Jarvis said. “It’s a great combination of easy access to useful information and cool features that will help millions of people capture their visits to their national parks.”

An Android version and other features will be added soon, the park service said.